<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      div {
        width: 200px;
        height: 200px;
        box-sizing: content-box;
        float: left;
      }
      div:nth-child(1) {
        background: red;
        z-index: 2;
      }
      div:nth-child(2) {
        background: yellow;
        /* position: relative; */
        /* left: -198px; */
        /* z-index: 0; */
      }
    </style>
  </head>
  <body>
    <div></div>
    <div></div>
  </body>
</html>
